no bottom end

[trxHRC450r]

2004 r and ive got an hrc kit, stock exhaust and a powerfilter. i had a wb e2 pipe on it but it broke and i went back to stock. i need i deas for jetting. ive got no bottom end, its ALL top end, and bogs when i whack the throttle in like 2nd in the woods from a roll until i get high in the revs. i also have a 13 tooth sprocket which helps. i do a lot of trail riding, and it had great power with the e2, but i have no money for another slip on.... any info will help

[oldskoolex400]

try adjusting the a/f screw, how big is the main jet? might need to go down a size or two, possibly more, and then adjust the needle, but try the a/f screw first